Type 304, or any other type employed in the manufacture of sinks will not stain, but it will corrode when it comes in contact with certain chemicals. Most common is pitting that results from bleach. Occasionally chemicals used on a construction site, like hydrochloric acid or calcium chloride, can ruin stainless steel. One substance that can cause rust-like eruptions if left in contact for an extended period of time is Triclosan. Triclosan is an organic chemical made up of three chlorine molecules that is used in most anti-bacterial soaps, such as Dial. The fact that it can corrode stainless stainless steel may be of concern not just for your sink, considering it is regularly used on your skin!

Actually, something as simple as table salt or garlic salt can also cause corrosion, if left on the surface for a few days. The key to keeping your sink like new is to wash it regularly. Stainless steel resists most adverse chemical reactions because it develops an inert surface layer that protects it from the environment. Regular washings remove contaminants, and allow the natural passive layer to renew itself.

The best news is that once these rust-like eruptions occur, they are easily removed with a maroon Scotch-Brite pad and a cleanser.